1605171345 has 16 divisors (see below), whose sum is σ = 2573034432. Its totient is φ = 854504640.

The previous prime is 1605171341. The next prime is 1605171349. The reversal of 1605171345 is 5431715061.

It is an interprime number because it is at equal distance from previous prime (1605171341) and next prime (1605171349).

It is not a de Polignac number, because 1605171345 - 2² = 1605171341 is a prime.

It is a super-3 number, since 3×1605171345³ (a number of 29 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1605171341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90787 + ... + 107016.

It is an arithmetic number, because the mean of its divisors is an integer number (160814652).

Almost surely, 2^1605171345 is an apocalyptic number.

1605171345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605171345 is a deficient number, since it is larger than the sum of its proper divisors (967863087).

1605171345 is a wasteful number, since it uses less digits than its factorization.

1605171345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198352.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 1605171345 is about 40064.5896646902. The cubic root of 1605171345 is about 1170.8658321829.

The spelling of 1605171345 in words is "one billion, six hundred five million, one hundred seventy-one thousand, three hundred forty-five".